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Mobile plethysmographic device

  • US 8,974,396 B1
  • Filed: 09/14/2014
  • Issued: 03/10/2015
  • Est. Priority Date: 09/14/2014
  • Status: Active Grant
First Claim
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1. A method for determining a premature atrial contraction event for a patient, the method comprising:

  • measuring a plethysmographic signal for a patient from an optical signal generated by an optical sensor and digitized and processed by a processor, the optical sensor and processor on a mobile plethysmographic device, the plethysmographic signal comprising a plurality of pulse waves, the mobile plethysmographic device comprising a three-axis accelerometer;

    identifying at the processor a maximum peak value for each pulse wave of the plurality of pulse waves of the plethysmographic signal to generate a plurality of maximum values of the plethysmographic signal;

    calculating at the processor a plurality of time intervals between adjacent maximum values of the plethysmographic signal;

    establishing at the processor a threshold minimum time interval and a threshold maximum time interval for the plurality of time intervals; and

    determining at the processor a premature atrial contraction event for the patient based on an identification of a time interval that is below the threshold minimum time interval followed immediately by a time interval that is above the threshold maximum time intervalusing three axis accelerometer information from the accelerometer to validate the premature atrial contraction event by measuring motion activity and verifying the validity of the premature atrial contraction event when the motion measured by the accelerometer remains less than a preset threshold.

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